Review: Redshift ShockStop may just change your mind about suspension seatposts - Bikerumor
ShockStop: The Shock-Absorbing Bike Stem by Redshift Sports — Kickstarter
Amazon.com : REDSHIFT ShockStop PRO Suspension Seatpost for Bicycles, Shock-Absorber Bike Seat Post for Road, Gravel, Hybrid, and E-Bikes, 280mm : Sports & Outdoors